External appearance and internal quality indicators of the fruits of ‘Zhongtaojinkui’ and ‘Zhongtaohongyu’ from two peach-producing areas at different altitudes. (A) Comparison of the longitudinal section of the fruit. (B–H) Comparison of the fruit’s vertical diameter (B), horizontal diameter (C), fruit shape index (D), firmness (E), soluble sugar content (F), titratable acid content (G), and sugar-acid ratio (H). LQ stands for ‘Longquanyi’, XD stands for ‘Xide’, JK stands for ‘Zhongtaojinkui’, and ‘HY’ stands for ‘Zhongtaohongyu’. One or two asterisks indicate statistical significance according to Student’s t-test at the 0.05 or 0.01 level, respectively.